Senate Minority Leader Chuck Schumer fired off a warning to President Donald Trump Monday after an FBI raid of Trump's lawyer's offices and home: firing Robert Mueller would be a mistake.

Mueller, a former FBI director, is leading the Department of Justice's Russia investigation.

On Monday, FBI agents acting on behalf of the probe raided the New York City offices of Trump's attorney Michael Cohen, his home, and a hotel room in which he has been staying as his apartment is renovated.

If @realDonaldTrump is thinking of using the FBI raid to fire Special Counsel Mueller or otherwise interfere with the chain of command in the Russia probe, we Democrats have one simple message for him: don’t.

Mueller, a Republican, has uncovered a deep & detailed pattern of Russian interference in our elections that led to indictments & guilty pleas. It also led to the Trump admin itself leveling sanctions against Russian individuals, proof that it’s not a so-called ‘witch-hunt.’